81530323 has 8 divisors (see below), whose sum is σ = 93354080. Its totient is φ = 69750720.

The previous prime is 81530287. The next prime is 81530333. The reversal of 81530323 is 32303518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81530323 - 2¹⁷ = 81399251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81530333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6978 + ... + 14551.

It is an arithmetic number, because the mean of its divisors is an integer number (11669260).

Almost surely, 2^81530323 is an apocalyptic number.

81530323 is a deficient number, since it is larger than the sum of its proper divisors (11823757).

81530323 is a wasteful number, since it uses less digits than its factorization.

81530323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22077.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 81530323 is about 9029.4143220920. The cubic root of 81530323 is about 433.6170870654.

The spelling of 81530323 in words is "eighty-one million, five hundred thirty thousand, three hundred twenty-three".